Question

Which statements about linear!! motion and forces are true and why? a) Given is a body moving at constant speed along a plane where friction occurs between the body and the plane. For it to work, an external force needs to pull on the body. b) The forces acting on an accelerated body do not add up to zero. c) If two stationary bodies with different masses are subjected to the same acceleration for a fixed time, the lighter body reaches a greater final velocity than the heavier one. d) Even if no forces act on a body, it can be subjected to an acceleration. e) If two stationary bodies with the same mass are to reach different final velocities after the same time, then the forces acting on the bodies must also be different. f) Twice as much force on a free body generally gives roughly twice the acceleration.

          Which statements about linear!! motion and forces are true and why?
a) Given is a body moving at constant speed along a plane where friction occurs between the body and the plane. For it to work, an external force needs to pull on the body.
b) The forces acting on an accelerated body do not add up to zero.
c) If two stationary bodies with different masses are subjected to the same acceleration for a fixed time, the lighter body reaches a greater final velocity than the heavier one.
d) Even if no forces act on a body, it can be subjected to an acceleration.
e) If two stationary bodies with the same mass are to reach different final velocities after the same time, then the forces acting on the bodies must also be different.
f) Twice as much force on a free body generally gives roughly twice the acceleration.

Added by Pedro W.

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